摘要
根据米耶理论,对均匀系中单粒子平均单次散射反照率的计算进行了研究,并分析了反照率与粒子尺度因子以及复折射率之间的关系。结果表明,当粒子尺度因子x较小时,反照率随着x的增大而增大,但是当x再继续增大时,反照率出现了"波动",总体呈现出减小的趋势,最终趋于0.5。利用米耶理论和van de hulst近似,还分别计算0.4～0.5μm和8～12μm光谱范围内气溶胶粒子的反照率,并进行了比较,结果表明,除了波长为3μm的邻域外,随着波长的增大,反照率逐渐减小,但是利用van de hulst近似所计算的结果在8～12μm光谱范围内有较大的误差。
Based on the Mie theory,the single scattering albedo of mono- particle is stuclied, relationship between the albedo ω, sixe factor x and complex refractive index m is analyzed.The results show that the albedo appears gradually big while x ascends,but the albedo appears fluctuant while x becomes larger,and finally equals to 0.5 approxlmately.The albedo of aerosols is also analyzed and compared with the results calculated according to the van de hulst＇s approximate theory in wavelengths 0.4 - 5μm and 8 ～ 12μm. The resalts proves that the aerosol albedo becomes small as the wavelength becomes large except the narowband at 3μm wavdength, and its value is usually consistent by dint of the Mie theory and the van de hulst＇s approximate theory, but the results estimated based on the second method has large error in wavelengths 8 ～ 12μm.
出处
《激光杂志》
CAS
CSCD
北大核心
2007年第4期45-46,共2页
Laser Journal
基金
国家自然科学基金-中国工程物理研究院联合基金(10376007)。
